<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JSONP</title>
</head>
<body>
    <button id="btn">发送ajax请求(jsonp)</button>
    <script>
        document.querySelector('#btn').onclick =() =>{
            const script = document.createElement('script')
            script.src = 'http://localhost:8181/jsonp-server?callback=fn'
            document.body.appendChild(script)

        }
        function fn(data){
            console.log(data)
            alert(data)
        }


    </script>
</body>
</html>